Application Research Of Railway Signalling Safety Information Transmission Based On The Communication System

With the rapid development of Chinese economy, higher requirements are purposed to railway. Consequently, by researching overseas railway safety standards and the relevant safety evaluation and safety validation systems and combining with the practice of development of Chinese railway communication and signalling, the safety evaluation and validation system of Chinese railway communication and signalling system must be established availably and in time. In this paper, the author researches the European serials standards developed by CENELEC, such as EN—50126, EN—50128, EN —50129 and EN —50159, and for the application of these standards in safety information transmission of railway signalling based on the communication system, some theories are also analyzed.Firstly, the paper discusses the necessity of constructing the railway signalling safety information transmission based on the communication system, and points out the TBTC system must be replaced by the CBTC system finally, and the integration of communication and signalling is the inevitable trend for railway development of every country. The necessity of establishing Chinese safety related railway standard is pointed. Secondly, the author studies the European railway safety standards and principles. The railway signalling safety information transmission lifecycle is constructed which is adapted to Chinese railway and based on the communication system, the tasks should be accomplished in 14 stages within this lifecycle are made. Restricted value of fault probability under variable safety integrity levels is indicated. How to realize fail—safe of railway signalling transmission system is discussed. The author puts forward a calculation method of safety code length in closed transmission system. The threats of open transmission system and safety design rules are analyzed. The theory of information transmission codes is introduced. The paper verifies the safety of European balise transmission protocol and estimates its safety transmission probability. The author testifies that this protocol can fulfill the requirement belong to SIL4 established in European standards and indicates that safety verification and evaluation to this protocol can guide and consult the transmission of railway signalling safety information based on the communication system. At last, the author draws the conclusion that the railway signalling safety information transmission based on the communication systems is feasible.